English translation: keypad protection (protective keypad cover)
Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
Explanation: As far as I can determine after looking at dozens of sites in German and English, the translation should simply be: keypad = Tastenmatte - the keys or buttons are often only thicker parts of the larger flexible, somewhat soft plastic piece under the cover of a device such as mobile or car phone, as shown in Gendebien's own reference: